An interface in Java defines a contract of methods that a class must implement. It supports multiple inheritance, enables abstraction, and plays a key role in Java’s Object-Oriented Programming (OOP) design by promoting loose coupling and polymorphism.
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Which keyword is used by a class to implement an interface?
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Question 4 of 15
4. Question
Can an interface contain variables in Java?
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Question 5 of 15
5. Question
Can an interface contain constructors?
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Question 6 of 15
6. Question
Can an interface have static methods in Java 8 and above?
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Question 7 of 15
7. Question
Can an interface extend another interface?
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Question 8 of 15
8. Question
What is the correct syntax for a class implementing two interfaces?
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Question 9 of 15
9. Question
What is the default access modifier for methods in an interface?
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Question 10 of 15
10. Question
Can a class both extend another class and implement an interface?
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Question 11 of 15
11. Question
Which of the following is true for Java interfaces?
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Question 12 of 15
12. Question
What are default methods in interfaces (Java 8+)?
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Question 13 of 15
13. Question
What is the result of not implementing all interface methods in a class?
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Question 14 of 15
14. Question
Which of the following is a benefit of using interfaces?
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Question 15 of 15
15. Question
Can an interface extend multiple interfaces?
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Summary
Interfaces in Java provide a mechanism to enforce contracts, support multiple inheritance, and promote abstraction and loose coupling. With enhancements in Java 8+, interfaces can now contain default and static methods, making them even more powerful for scalable software design.
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